Blue eyes are a genetic mutation. Before the mutation occured, all humans had brown eyes.
89
There's 100 trillion good bacteria living in your body.
17
Our eyes are always the same size from birth, but our nose and ears never stop growing.
269
Staying awake for 17 hours is the same for your body as drinking 2 glasses of wine.
193
The average sperm cell swims at 8 inches per hour.
76
If every muscle in your body could pull in one direction, you could lift nearly 25 tons.
12
You see your nose at all times, your brain just chooses to ignore it.
30
